Film pack



June 22 1926.

1,589,695 w. HOHMANN FILM PACK Filed Nov. 3, 1923 fliiizwmegs Patented June 22, 1926.

UNITED STATES PATENT OFFICE.

WILHELM HOHMANN, OF DELITZSCH, NEAR HALLE, GERMANY, ASSIGNOR TO ACTIEN GESELLSCHAFT FllR ANILIN FABRIKATION, OF BERLIN, GERMANY.

FILM PACK.

Application filed November 3, 1923, Serial No. 672,634, and in Germany January 13, 1923.

The invention relates to a film pack with tabs and consists of an outer sheath of pasteboard, or other similar material and an inner case of sheet metal with a continuous partition between the exposed and unexposed films. Packs having an outer paste-board sheath besides effecting substantial saving in weight as compared with packs entirely of sheet metal enable the films to be drawn more easily owing to the greater flexibility of the pasteboard walls in comparison with the rigid metal casing. In order, however, to fully utilize these advantages the individual parts of the inner metal case must also be as flexible aspossible, so as to facilitate the changing of the films. At the same time, it is desirable that the case should. constitute a framing for the outer casing, which is very liable to be deformed, and thus prevent it from bulging outward and thereby admitting light to the films, especially at the exposure aperture.

Film packs which fulfil one or the other of these requirements are known, but these advantages are obtained at the cost of a third requirement. Thus, for example, in a known device, the resilient flexibility of the partition is obtained by the arrangement of a second wall inclined to the first, the result being a considerable increase in weight. In another known film pack the sheet metal insertion is formed mainly by a continuous partition, which is arranged in the pasteboard casing so as to yield easily. This inserti on is of slight weight and is sufliciently resilient when the clamping strips are drawn down, but it does not provide sufficient stiffening for the outer pasteboard sheath or a. suflicient guide for the films at the back to prevent tearing at the projecting stops when pulled obliquely. Another known sheet in sertion eliminates these disadvantages and gives the pasteboard sheath a suiiicient hold, but the partition is rigid and unyielding within the casing, so that the resistance offered on changing over the film is considerably increased.

The object of the present invention is to obtain the described advantages with an outer pasteboard sheath without entailing any of the disadvantages referred to. For this purpose the central partition, which divides the pack into two approximately equal spaces for the exposed and the unexposed films, is rigidly connected, for a part only of its length, with the outer pasteboard cas mg by means of two lateral members which bear against the long narrow sides of the outer casing; the other parts, however, of this partition, the free end of which is formed as a change over bridge for the films. are adapted to move so as to be bent out of their central plane to either side. For this purpose it is suiiicient to hinge together-in any simple manner the two parts of the partition at their junction. It is preferable, however, to impart resilient flexibility to the free end of the central partition, either by the arrangement of spring members or by utilizing the resilience of the sheet metal partition itself.

The accompanying drawings illustrate various constructions according to the invention:

Fig. 1 represents a complete pack in longitudinal section.

Fig. 2 is a view of the sheet insertion seen from the back, the pasteboard sheath being shown in section and the contents of the pack assumed to be withdrawn. The movable end of the partition is hinged to the fixed part by means of clamps.

In Figs. 3*9 modifications of the sheet metal insertion are shown in longitudinal section, plan or in cross section.

Figs. 3 and 4.- show a construction with spring connecting members between the fixed and the movable part of the partition.

Figs. 57 show a construction in which the central partition is made in one piece and springs at its free end by its own elasticit Fig. 7 is a section on the line 11 of Fig. 6.

Figs. 8 and 9 show the construction of the elastic part of the partition in the form of tongues, which at the same time press the unexposed film strips against the exposure aperture.

'In Figs. 1 and 2 the films a with tabs 1) are stored in known manner on both sides of the partition 0 or 0 and are inclosed lighttight by the outer sheath d by means of folded over strips d, of velvet.

The partition 0, is connected below with a cross-piece e "which overlaps at its, front surface 7' the ends of the unexposed films eems ti1ne,'the --stri "s and at the back has a sloping guide-surface g and on both sides external stops h to limit the motion of the withdrawn exposed films. Onboth sides off the partition, alongthe narrow sides or" the pack, are arranged sheet metal members 2' (Fig. 7) with which both the cross-piece e and the partition 0, are rigidly connected, for example by means of punched out and bent over clips k A The movable part 0,, is hinged on the ppper end of the fixed part 0 of the part tion, for example by small wire clamps Z, which are passed tlrrdngh "corresponding holes in both parts and then bent together. The sheet metal is hooked over atthe end of the partitionqto form a change over bridge m 'over which the exposed films are withdrawn in known manner to the back of the pack. Spring tongues a, which press the unexposed films against the frame 0 of the outer pasteboard sheath are bent out from the part1- tion 0 a, in known manner. To save weight, openings 79 are also provided ate-ppropriate positions in thesheet metal partition.

In Figs. 3 and 4 the fixed part of the partition 0 is connected wlth the flexible part 0 by very thin leaf springs g, wh1 ch rn'ay overlap both parts for a certain dis tance on one side and are suitably connected therewith, for example by cutting out and bending together strips 0.

A modification of the invention is shown in Figs. 5 7. The partition 0 in this case consists of a single piece and is connected with lateral mem'bers z'at several points as shown in Fig. '7 by means of strips 7a,, 0 -so as to enable the iprojecting end of the sheet metal-partition to bend elastically about the line 11 of Fig. 6. By shifting the line ll forward or back, as well as by enlarging orreducing the openings p the "resilience of the free end of the partition 0 may be controlled'as desired.

Finally, in the'construction shown in Figs. "8 and-9, only two strips oft'he flexible part of the central E'partition c are retained, through the hooked. end. of which a c'ylin '{drical 110C142 is passed, which serves as a change "over bridge for the films. :At the are bent some-what out of the central plane of the walls, so as tojpressthe contents of the pack resiliently against the exposure chamber ot-the out'er ca'slng, thus Obfilblllgihfi necessity for providing particular tongues n for this purpose at this point. When, therefore, an-exposed :filan is being drawnover, a tensile force P *is exerted on'the change over bridge which springs in the direction of the arrow and "returns-to its previous'position when the film is drawn over.

I do not wish to be understood as limit- =ing=myselt to the exact details of construction hereintofore described-or shown -in accoinpanying drawings as it is obvious that these details may be modified without departing from the general principle.

Having now described my invention what .i claim is,

1. A film pack with tabs, consisting of an outer pasteboard casing and an inner sheet-metal case including two continuous lateral members and a central partition which divides the length of the pack space :in :two and together with the said continuous lateral members forms an I-shaped crosssection, andat one end defines a change o'ver bridge, the partition for a part of its length being rigidly connected with the lateral lnembers and at the end neXt the change over bridge being adapted to be displaced from its normal position.

2. A film pack with tabs, consisting of an outer pasteboard casing and an inner sheet metal case including two continuous lateral members and a central partition which divides the length of the pack space in two and together with the said continuous lateral members forms an I-shaped cross-section, and at one end defines a change-over bridge, the partition for a part-o f :its length being rigidly connected with vthe said lateral members and at the end nentthechange over bridge being adapted to be displaced elastically from its 10111131 position.

3. A film pack with tabs, consisting of an outer :pasteboard casingand an inner sheet metal case including two continuous lateral members ands central partition which-divides the length of the pack space :in *two and together with the-said continuous lateral members forms an I-shaped cross-section, and at one end defines a change-over bridge, the partition comprising two pertrons, one of which is rigidly connected with the lateral. members and the other at the end next the change over bridge being adapted to be displaced'elastically from its normal position, and defining spring members :de- ,fiecte'd laterally out of the general plane of tl1e.partition. i i r V 4-. A film pack with tabs consisting of an outer t-pasteboard casing and an inner sheet v-nieta'l case including "two continuous lateil 'ibers and a central partition W1 4 .1'Cill .Cl8S the -length of the pack space in two and together with the'said-continrb one lateral members :forinsan Lshaped cross section,:anid=at one end defines a change-over bridge, the partition 'for apart of its len'gth being rigidl-y connected with the lateral members and lravinganother portion adapted to be elastically displaced i rom its noranal position, said other portion having its centralportion punched out to'dcfine spring clips, the spring clips being bent so as to press afilm'strip against the-enposure frame and being miter-connected at their free ends to define 1 a change-over bridge.

5. In a film pack, the combination with members so as to leave a portion of the an outer casing of a material having the partition free to move out of its normal pocharacter of paste board, of an inner metal sition, the said portion being formed at its 10 case comprising a sheet metal partition disfree end to define a change-over bridge.

5 posed to divide the pack space in two parts, In testlmony whe eof I affiX my Signalateral frame members, means rigidly eonnecting a part of the partition to the said DR. ING: VVILHELM HOHMANN. 

